drivers/mtd/mtdchar.c

   1 /*
   2  * $Id: mtdchar.c,v 1.76 2005/11/07 11:14:20 gleixner Exp $
   3  *
   4  * Character-device access to raw MTD devices.
   5  *
   6  */
   7
   8 #include <linux/config.h>
   9 #include <linux/device.h>
  10 #include <linux/fs.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/sched.h>
  16
  17 #include <linux/mtd/mtd.h>
  18 #include <linux/mtd/compatmac.h>
  19
  20 #include <asm/uaccess.h>
  21
  22 static struct class *mtd_class;
  23
  24 static void mtd_notify_add(struct mtd_info* mtd)
  25 {
  26         if (!mtd)
  27                 return;
  28
  29         class_device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
  30                             NULL, "mtd%d", mtd->index);
  31
  32         class_device_create(mtd_class, NULL,
  33                             MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
  34                             NULL, "mtd%dro", mtd->index);
  35 }
  36
  37 static void mtd_notify_remove(struct mtd_info* mtd)
  38 {
  39         if (!mtd)
  40                 return;
  41
  42         class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
  43         class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
  44 }
  45
  46 static struct mtd_notifier notifier = {
  47         .add    = mtd_notify_add,
  48         .remove = mtd_notify_remove,
  49 };
  50
  51 /*
  52  * Data structure to hold the pointer to the mtd device as well
  53  * as mode information ofr various use cases.
  54  */
  55 struct mtd_file_info {
  56         struct mtd_info *mtd;
  57         enum mtd_file_modes mode;
  58 };
  59
  60 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
  61 {
  62         struct mtd_file_info *mfi = file->private_data;
  63         struct mtd_info *mtd = mfi->mtd;
  64
  65         switch (orig) {
  66         case 0:
  67                 /* SEEK_SET */
  68                 break;
  69         case 1:
  70                 /* SEEK_CUR */
  71                 offset += file->f_pos;
  72                 break;
  73         case 2:
  74                 /* SEEK_END */
  75                 offset += mtd->size;
  76                 break;
  77         default:
  78                 return -EINVAL;
  79         }
  80
  81         if (offset >= 0 && offset <= mtd->size)
  82                 return file->f_pos = offset;
  83
  84         return -EINVAL;
  85 }
  86
  87
  88
  89 static int mtd_open(struct inode *inode, struct file *file)
  90 {
  91         int minor = iminor(inode);
  92         int devnum = minor >> 1;
  93         struct mtd_info *mtd;
  94         struct mtd_file_info *mfi;
  95
  96         DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
  97
  98         if (devnum >= MAX_MTD_DEVICES)
  99                 return -ENODEV;
 100
 101         /* You can't open the RO devices RW */
 102         if ((file->f_mode & 2) && (minor & 1))
 103                 return -EACCES;
 104
 105         mtd = get_mtd_device(NULL, devnum);
 106
 107         if (!mtd)
 108                 return -ENODEV;
 109
 110         if (MTD_ABSENT == mtd->type) {
 111                 put_mtd_device(mtd);
 112                 return -ENODEV;
 113         }
 114
 115         /* You can't open it RW if it's not a writeable device */
 116         if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
 117                 put_mtd_device(mtd);
 118                 return -EACCES;
 119         }
 120
 121         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
 122         if (!mfi) {
 123                 put_mtd_device(mtd);
 124                 return -ENOMEM;
 125         }
 126         mfi->mtd = mtd;
 127         file->private_data = mfi;
 128
 129         return 0;
 130 } /* mtd_open */
 131
 132 /*====================================================================*/
 133
 134 static int mtd_close(struct inode *inode, struct file *file)
 135 {
 136         struct mtd_file_info *mfi = file->private_data;
 137         struct mtd_info *mtd = mfi->mtd;
 138
 139         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 140
 141         if (mtd->sync)
 142                 mtd->sync(mtd);
 143
 144         put_mtd_device(mtd);
 145         file->private_data = NULL;
 146         kfree(mfi);
 147
 148         return 0;
 149 } /* mtd_close */
 150
 151 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
 152    userspace buffer down and use it directly with readv/writev.
 153 */
 154 #define MAX_KMALLOC_SIZE 0x20000
 155
 156 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 157 {
 158         struct mtd_file_info *mfi = file->private_data;
 159         struct mtd_info *mtd = mfi->mtd;
 160         size_t retlen=0;
 161         size_t total_retlen=0;
 162         int ret=0;
 163         int len;
 164         char *kbuf;
 165
 166         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
 167
 168         if (*ppos + count > mtd->size)
 169                 count = mtd->size - *ppos;
 170
 171         if (!count)
 172                 return 0;
 173
 174         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
 175            and pass them directly to the MTD functions */
 176
 177         if (count > MAX_KMALLOC_SIZE)
 178                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 179         else
 180                 kbuf=kmalloc(count, GFP_KERNEL);
 181
 182         if (!kbuf)
 183                 return -ENOMEM;
 184
 185         while (count) {
 186
 187                 if (count > MAX_KMALLOC_SIZE)
 188                         len = MAX_KMALLOC_SIZE;
 189                 else
 190                         len = count;
 191
 192                 switch (mfi->mode) {
 193                 case MTD_MODE_OTP_FACTORY:
 194                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 195                         break;
 196                 case MTD_MODE_OTP_USER:
 197                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 198                         break;
 199                 case MTD_MODE_RAW:
 200                 {
 201                         struct mtd_oob_ops ops;
 202
 203                         ops.mode = MTD_OOB_RAW;
 204                         ops.datbuf = kbuf;
 205                         ops.oobbuf = NULL;
 206                         ops.len = len;
 207
 208                         ret = mtd->read_oob(mtd, *ppos, &ops);
 209                         retlen = ops.retlen;
 210                         break;
 211                 }
 212                 default:
 213                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
 214                 }
 215                 /* Nand returns -EBADMSG on ecc errors, but it returns
 216                  * the data. For our userspace tools it is important
 217                  * to dump areas with ecc errors !
 218                  * For kernel internal usage it also might return -EUCLEAN
 219                  * to signal the caller that a bitflip has occured and has
 220                  * been corrected by the ECC algorithm.
 221                  * Userspace software which accesses NAND this way
 222                  * must be aware of the fact that it deals with NAND
 223                  */
 224                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
 225                         *ppos += retlen;
 226                         if (copy_to_user(buf, kbuf, retlen)) {
 227                                 kfree(kbuf);
 228                                 return -EFAULT;
 229                         }
 230                         else
 231                                 total_retlen += retlen;
 232
 233                         count -= retlen;
 234                         buf += retlen;
 235                         if (retlen == 0)
 236                                 count = 0;
 237                 }
 238                 else {
 239                         kfree(kbuf);
 240                         return ret;
 241                 }
 242
 243         }
 244
 245         kfree(kbuf);
 246         return total_retlen;
 247 } /* mtd_read */
 248
 249 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
 250 {
 251         struct mtd_file_info *mfi = file->private_data;
 252         struct mtd_info *mtd = mfi->mtd;
 253         char *kbuf;
 254         size_t retlen;
 255         size_t total_retlen=0;
 256         int ret=0;
 257         int len;
 258
 259         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
 260
 261         if (*ppos == mtd->size)
 262                 return -ENOSPC;
 263
 264         if (*ppos + count > mtd->size)
 265                 count = mtd->size - *ppos;
 266
 267         if (!count)
 268                 return 0;
 269
 270         if (count > MAX_KMALLOC_SIZE)
 271                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 272         else
 273                 kbuf=kmalloc(count, GFP_KERNEL);
 274
 275         if (!kbuf)
 276                 return -ENOMEM;
 277
 278         while (count) {
 279
 280                 if (count > MAX_KMALLOC_SIZE)
 281                         len = MAX_KMALLOC_SIZE;
 282                 else
 283                         len = count;
 284
 285                 if (copy_from_user(kbuf, buf, len)) {
 286                         kfree(kbuf);
 287                         return -EFAULT;
 288                 }
 289
 290                 switch (mfi->mode) {
 291                 case MTD_MODE_OTP_FACTORY:
 292                         ret = -EROFS;
 293                         break;
 294                 case MTD_MODE_OTP_USER:
 295                         if (!mtd->write_user_prot_reg) {
 296                                 ret = -EOPNOTSUPP;
 297                                 break;
 298                         }
 299                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 300                         break;
 301
 302                 case MTD_MODE_RAW:
 303                 {
 304                         struct mtd_oob_ops ops;
 305
 306                         ops.mode = MTD_OOB_RAW;
 307                         ops.datbuf = kbuf;
 308                         ops.oobbuf = NULL;
 309                         ops.len = len;
 310
 311                         ret = mtd->write_oob(mtd, *ppos, &ops);
 312                         retlen = ops.retlen;
 313                         break;
 314                 }
 315
 316                 default:
 317                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
 318                 }
 319                 if (!ret) {
 320                         *ppos += retlen;
 321                         total_retlen += retlen;
 322                         count -= retlen;
 323                         buf += retlen;
 324                 }
 325                 else {
 326                         kfree(kbuf);
 327                         return ret;
 328                 }
 329         }
 330
 331         kfree(kbuf);
 332         return total_retlen;
 333 } /* mtd_write */
 334
 335 /*======================================================================
 336
 337     IOCTL calls for getting device parameters.
 338
 339 ======================================================================*/
 340 static void mtdchar_erase_callback (struct erase_info *instr)
 341 {
 342         wake_up((wait_queue_head_t *)instr->priv);
 343 }
 344
 345 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 346 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 347 {
 348         struct mtd_info *mtd = mfi->mtd;
 349         int ret = 0;
 350
 351         switch (mode) {
 352         case MTD_OTP_FACTORY:
 353                 if (!mtd->read_fact_prot_reg)
 354                         ret = -EOPNOTSUPP;
 355                 else
 356                         mfi->mode = MTD_MODE_OTP_FACTORY;
 357                 break;
 358         case MTD_OTP_USER:
 359                 if (!mtd->read_fact_prot_reg)
 360                         ret = -EOPNOTSUPP;
 361                 else
 362                         mfi->mode = MTD_MODE_OTP_USER;
 363                 break;
 364         default:
 365                 ret = -EINVAL;
 366         case MTD_OTP_OFF:
 367                 break;
 368         }
 369         return ret;
 370 }
 371 #else
 372 # define otp_select_filemode(f,m)       -EOPNOTSUPP
 373 #endif
 374
 375 static int mtd_ioctl(struct inode *inode, struct file *file,
 376                      u_int cmd, u_long arg)
 377 {
 378         struct mtd_file_info *mfi = file->private_data;
 379         struct mtd_info *mtd = mfi->mtd;
 380         void __user *argp = (void __user *)arg;
 381         int ret = 0;
 382         u_long size;
 383         struct mtd_info_user info;
 384
 385         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
 386
 387         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
 388         if (cmd & IOC_IN) {
 389                 if (!access_ok(VERIFY_READ, argp, size))
 390                         return -EFAULT;
 391         }
 392         if (cmd & IOC_OUT) {
 393                 if (!access_ok(VERIFY_WRITE, argp, size))
 394                         return -EFAULT;
 395         }
 396
 397         switch (cmd) {
 398         case MEMGETREGIONCOUNT:
 399                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
 400                         return -EFAULT;
 401                 break;
 402
 403         case MEMGETREGIONINFO:
 404         {
 405                 struct region_info_user ur;
 406
 407                 if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
 408                         return -EFAULT;
 409
 410                 if (ur.regionindex >= mtd->numeraseregions)
 411                         return -EINVAL;
 412                 if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
 413                                 sizeof(struct mtd_erase_region_info)))
 414                         return -EFAULT;
 415                 break;
 416         }
 417
 418         case MEMGETINFO:
 419                 info.type       = mtd->type;
 420                 info.flags      = mtd->flags;
 421                 info.size       = mtd->size;
 422                 info.erasesize  = mtd->erasesize;
 423                 info.writesize  = mtd->writesize;
 424                 info.oobsize    = mtd->oobsize;
 425                 info.ecctype    = mtd->ecctype;
 426                 info.eccsize    = mtd->eccsize;
 427                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 428                         return -EFAULT;
 429                 break;
 430
 431         case MEMERASE:
 432         {
 433                 struct erase_info *erase;
 434
 435                 if(!(file->f_mode & 2))
 436                         return -EPERM;
 437
 438                 erase=kmalloc(sizeof(struct erase_info),GFP_KERNEL);
 439                 if (!erase)
 440                         ret = -ENOMEM;
 441                 else {
 442                         wait_queue_head_t waitq;
 443                         DECLARE_WAITQUEUE(wait, current);
 444
 445                         init_waitqueue_head(&waitq);
 446
 447                         memset (erase,0,sizeof(struct erase_info));
 448                         if (copy_from_user(&erase->addr, argp,
 449                                     sizeof(struct erase_info_user))) {
 450                                 kfree(erase);
 451                                 return -EFAULT;
 452                         }
 453                         erase->mtd = mtd;
 454                         erase->callback = mtdchar_erase_callback;
 455                         erase->priv = (unsigned long)&waitq;
 456
 457                         /*
 458                           FIXME: Allow INTERRUPTIBLE. Which means
 459                           not having the wait_queue head on the stack.
 460
 461                           If the wq_head is on the stack, and we
 462                           leave because we got interrupted, then the
 463                           wq_head is no longer there when the
 464                           callback routine tries to wake us up.
 465                         */
 466                         ret = mtd->erase(mtd, erase);
 467                         if (!ret) {
 468                                 set_current_state(TASK_UNINTERRUPTIBLE);
 469                                 add_wait_queue(&waitq, &wait);
 470                                 if (erase->state != MTD_ERASE_DONE &&
 471                                     erase->state != MTD_ERASE_FAILED)
 472                                         schedule();
 473                                 remove_wait_queue(&waitq, &wait);
 474                                 set_current_state(TASK_RUNNING);
 475
 476                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 477                         }
 478                         kfree(erase);
 479                 }
 480                 break;
 481         }
 482
 483         case MEMWRITEOOB:
 484         {
 485                 struct mtd_oob_buf buf;
 486                 struct mtd_oob_ops ops;
 487
 488                 if(!(file->f_mode & 2))
 489                         return -EPERM;
 490
 491                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 492                         return -EFAULT;
 493
 494                 if (buf.length > 4096)
 495                         return -EINVAL;
 496
 497                 if (!mtd->write_oob)
 498                         ret = -EOPNOTSUPP;
 499                 else
 500                         ret = access_ok(VERIFY_READ, buf.ptr,
 501                                         buf.length) ? 0 : EFAULT;
 502
 503                 if (ret)
 504                         return ret;
 505
 506                 ops.len = buf.length;
 507                 ops.ooblen = buf.length;
 508                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 509                 ops.datbuf = NULL;
 510                 ops.mode = MTD_OOB_PLACE;
 511
 512                 if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs))
 513                         return -EINVAL;
 514
 515                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 516                 if (!ops.oobbuf)
 517                         return -ENOMEM;
 518
 519                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 520                         kfree(ops.oobbuf);
 521                         return -EFAULT;
 522                 }
 523
 524                 buf.start &= ~(mtd->oobsize - 1);
 525                 ret = mtd->write_oob(mtd, buf.start, &ops);
 526
 527                 if (copy_to_user(argp + sizeof(uint32_t), &ops.retlen,
 528                                  sizeof(uint32_t)))
 529                         ret = -EFAULT;
 530
 531                 kfree(ops.oobbuf);
 532                 break;
 533
 534         }
 535
 536         case MEMREADOOB:
 537         {
 538                 struct mtd_oob_buf buf;
 539                 struct mtd_oob_ops ops;
 540
 541                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 542                         return -EFAULT;
 543
 544                 if (buf.length > 4096)
 545                         return -EINVAL;
 546
 547                 if (!mtd->read_oob)
 548                         ret = -EOPNOTSUPP;
 549                 else
 550                         ret = access_ok(VERIFY_WRITE, buf.ptr,
 551                                         buf.length) ? 0 : -EFAULT;
 552                 if (ret)
 553                         return ret;
 554
 555                 ops.len = buf.length;
 556                 ops.ooblen = buf.length;
 557                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 558                 ops.datbuf = NULL;
 559                 ops.mode = MTD_OOB_PLACE;
 560
 561                 if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs))
 562                         return -EINVAL;
 563
 564                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 565                 if (!ops.oobbuf)
 566                         return -ENOMEM;
 567
 568                 buf.start &= ~(mtd->oobsize - 1);
 569                 ret = mtd->read_oob(mtd, buf.start, &ops);
 570
 571                 if (put_user(ops.retlen, (uint32_t __user *)argp))
 572                         ret = -EFAULT;
 573                 else if (ops.retlen && copy_to_user(buf.ptr, ops.oobbuf,
 574                                                     ops.retlen))
 575                         ret = -EFAULT;
 576
 577                 kfree(ops.oobbuf);
 578                 break;
 579         }
 580
 581         case MEMLOCK:
 582         {
 583                 struct erase_info_user info;
 584
 585                 if (copy_from_user(&info, argp, sizeof(info)))
 586                         return -EFAULT;
 587
 588                 if (!mtd->lock)
 589                         ret = -EOPNOTSUPP;
 590                 else
 591                         ret = mtd->lock(mtd, info.start, info.length);
 592                 break;
 593         }
 594
 595         case MEMUNLOCK:
 596         {
 597                 struct erase_info_user info;
 598
 599                 if (copy_from_user(&info, argp, sizeof(info)))
 600                         return -EFAULT;
 601
 602                 if (!mtd->unlock)
 603                         ret = -EOPNOTSUPP;
 604                 else
 605                         ret = mtd->unlock(mtd, info.start, info.length);
 606                 break;
 607         }
 608
 609         /* Legacy interface */
 610         case MEMGETOOBSEL:
 611         {
 612                 struct nand_oobinfo oi;
 613
 614                 if (!mtd->ecclayout)
 615                         return -EOPNOTSUPP;
 616                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
 617                         return -EINVAL;
 618
 619                 oi.useecc = MTD_NANDECC_AUTOPLACE;
 620                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
 621                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
 622                        sizeof(oi.oobfree));
 623
 624                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 625                         return -EFAULT;
 626                 break;
 627         }
 628
 629         case MEMGETBADBLOCK:
 630         {
 631                 loff_t offs;
 632
 633                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 634                         return -EFAULT;
 635                 if (!mtd->block_isbad)
 636                         ret = -EOPNOTSUPP;
 637                 else
 638                         return mtd->block_isbad(mtd, offs);
 639                 break;
 640         }
 641
 642         case MEMSETBADBLOCK:
 643         {
 644                 loff_t offs;
 645
 646                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 647                         return -EFAULT;
 648                 if (!mtd->block_markbad)
 649                         ret = -EOPNOTSUPP;
 650                 else
 651                         return mtd->block_markbad(mtd, offs);
 652                 break;
 653         }
 654
 655 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 656         case OTPSELECT:
 657         {
 658                 int mode;
 659                 if (copy_from_user(&mode, argp, sizeof(int)))
 660                         return -EFAULT;
 661
 662                 mfi->mode = MTD_MODE_NORMAL;
 663
 664                 ret = otp_select_filemode(mfi, mode);
 665
 666                 file->f_pos = 0;
 667                 break;
 668         }
 669
 670         case OTPGETREGIONCOUNT:
 671         case OTPGETREGIONINFO:
 672         {
 673                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
 674                 if (!buf)
 675                         return -ENOMEM;
 676                 ret = -EOPNOTSUPP;
 677                 switch (mfi->mode) {
 678                 case MTD_MODE_OTP_FACTORY:
 679                         if (mtd->get_fact_prot_info)
 680                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
 681                         break;
 682                 case MTD_MODE_OTP_USER:
 683                         if (mtd->get_user_prot_info)
 684                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
 685                         break;
 686                 default:
 687                         break;
 688                 }
 689                 if (ret >= 0) {
 690                         if (cmd == OTPGETREGIONCOUNT) {
 691                                 int nbr = ret / sizeof(struct otp_info);
 692                                 ret = copy_to_user(argp, &nbr, sizeof(int));
 693                         } else
 694                                 ret = copy_to_user(argp, buf, ret);
 695                         if (ret)
 696                                 ret = -EFAULT;
 697                 }
 698                 kfree(buf);
 699                 break;
 700         }
 701
 702         case OTPLOCK:
 703         {
 704                 struct otp_info info;
 705
 706                 if (mfi->mode != MTD_MODE_OTP_USER)
 707                         return -EINVAL;
 708                 if (copy_from_user(&info, argp, sizeof(info)))
 709                         return -EFAULT;
 710                 if (!mtd->lock_user_prot_reg)
 711                         return -EOPNOTSUPP;
 712                 ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
 713                 break;
 714         }
 715 #endif
 716
 717         case ECCGETLAYOUT:
 718         {
 719                 if (!mtd->ecclayout)
 720                         return -EOPNOTSUPP;
 721
 722                 if (copy_to_user(argp, &mtd->ecclayout,
 723                                  sizeof(struct nand_ecclayout)))
 724                         return -EFAULT;
 725                 break;
 726         }
 727
 728         case ECCGETSTATS:
 729         {
 730                 if (copy_to_user(argp, &mtd->ecc_stats,
 731                                  sizeof(struct mtd_ecc_stats)))
 732                         return -EFAULT;
 733                 break;
 734         }
 735
 736         case MTDFILEMODE:
 737         {
 738                 mfi->mode = 0;
 739
 740                 switch(arg) {
 741                 case MTD_MODE_OTP_FACTORY:
 742                 case MTD_MODE_OTP_USER:
 743                         ret = otp_select_filemode(mfi, arg);
 744                         break;
 745
 746                 case MTD_MODE_RAW:
 747                         if (!mtd->read_oob || !mtd->write_oob)
 748                                 return -EOPNOTSUPP;
 749                         mfi->mode = arg;
 750
 751                 case MTD_MODE_NORMAL:
 752                         break;
 753                 default:
 754                         ret = -EINVAL;
 755                 }
 756                 file->f_pos = 0;
 757                 break;
 758         }
 759
 760         default:
 761                 ret = -ENOTTY;
 762         }
 763
 764         return ret;
 765 } /* memory_ioctl */
 766
 767 static struct file_operations mtd_fops = {
 768         .owner          = THIS_MODULE,
 769         .llseek         = mtd_lseek,
 770         .read           = mtd_read,
 771         .write          = mtd_write,
 772         .ioctl          = mtd_ioctl,
 773         .open           = mtd_open,
 774         .release        = mtd_close,
 775 };
 776
 777 static int __init init_mtdchar(void)
 778 {
 779         if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
 780                 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
 781                        MTD_CHAR_MAJOR);
 782                 return -EAGAIN;
 783         }
 784
 785         mtd_class = class_create(THIS_MODULE, "mtd");
 786
 787         if (IS_ERR(mtd_class)) {
 788                 printk(KERN_ERR "Error creating mtd class.\n");
 789                 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 790                 return PTR_ERR(mtd_class);
 791         }
 792
 793         register_mtd_user(&notifier);
 794         return 0;
 795 }
 796
 797 static void __exit cleanup_mtdchar(void)
 798 {
 799         unregister_mtd_user(&notifier);
 800         class_destroy(mtd_class);
 801         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 802 }
 803
 804 module_init(init_mtdchar);
 805 module_exit(cleanup_mtdchar);
 806
 807
 808 MODULE_LICENSE("GPL");
 809 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 810 MODULE_DESCRIPTION("Direct character-device access to MTD devices");